Before this I have already done two more smart watch teardown, Boat and Mi Redmi. BeatXP design features are similar to boat’s smart watch but the electronics is quite different and architecture is a bit different too.
It is interesting to see how different designers chose different components and implements similar features in a product.
BeatXP Smart Watch comes in a nice packaging. They also provide a lot of nice stickers inside which my Son likes the most.
BeatXP Smart Watch Packaging
BeatXP Smart Watch from outside
From the outside, the smart watch looks like this.
You can clearly see on the enclosure, MIC and Speaker holes.
BeatXP Smart Watch Display Panel
As with any smart watch, you can only open once you heat the enclosure from sides. And after opening you will get a display panel and the main PCB.
See some images below:
In the image below you can clearly see that the capacitive touch panel is connector to main display Panel PCB (soldered directly)
The Capacitive touch panel IC part number is scratched but it will be a typical 6 pin, I2C based interface.
The display has 24-pin dual side connector.
The tape you are seeing is a shielding tap.
And this tape is basically thermal tape to protect the PCB from heat when you heat the watch for opening.
Also, it isolates heat from going from PCB to Display side or heating coming from Display to the PCB.
BeatXP Smart Watch Main PCB
Once you remove the thermal tape carefully, you can see all the ICs on the Main PCB.
1st thing you will notice is the Main controller is from GOODIX, GR5515I0NDA
The Goodix GR551x family is a single-mode, low-power Bluetooth 5.1 System-on-Chip (SoC). It can be configured as a Broadcaster, an Observer, a Central, or a Peripheral and supports the combination of all the above roles, making it an ideal choice for Internet of Things (IoT) and smart wearable devices.
Based on ARM® Cortex®-M4F CPU core, the GR551x series integrates Bluetooth 5.1 Protocol Stack, a 2.4 GHz RF transceiver, on-chip programmable Flash memory, RAM, and multiple peripherals.
Along with SoC, you will see SPI NOR Flash which is surprisingly the biggest IC on the main PCB.
SPI NOR FLASH is from PUYA SEMI P25Q64, 64Mbit, 8MB Memory.
Next thing you will notice is above the SoC, two chips, one is battery charger and other one is Audio Amplifier for the speaker.
The Battery charger used is SY8602. SY8602 is a single-lithium battery linear-charging IC with integrated high voltage input (28V).
Typical Block Diagram is given below:
The Audio Amplifier used is XA2611B.
XA2611B is a mono-channel AB/D class optional audio power amplifier circuit. Its low-noise pulse width modulation architecture reduces the number of external components, circuit board area consumption, system cost, and simplifies design.
XA2611B adopts QFN3*3-20 package, which is particularly suitable for use in small-sized portable systems. XA2611B has an internal overheating automatic shutdown protection mechanism and a built-in feedback resistor. By configuring peripheral parameters, the voltage gain of the amplifier and the best sound quality can be adjusted. It is convenient for application and is the perfect solution for your smart wearables, tablets and other devices.
For Bluetooth calling feature, it has JT jerry Bluetooth Audio Receiver IC, The part number is not very clear but it is BP18682063A4, I could not locate the datasheet.
You can see in the image below, two wires are used, the black one is for Bluetooth interface from GOODIX and another one is for Jerry Bluetooth Receiver IC. RF marking is visible on the PCB.
BeatXP Smart Watch Back side of the Main PCB
On the back side of the PCB, there are no components but some test points and connector pads.
After removing the PCB, you will find the battery.
It’s a 3.7V Li-Ion 280mAh battery, typical size used in a smart watch.
under the battery, you will find speaker, mic, vibration motor attached to the enclosure.
You can see left side, the rectangular item is the speaker and above that is the vibration motor. Top right corner with white glue is the condenser MIC.
After removing the Speaker and vibration motor from the enclosure.
And, here is you MIC.
At the center you can see the sensor. Let us remove that and see what is there.
BeatXP Smart Watch from Sensor Board
So you get a flex PCB with LED and Photo Diode with a front end IC HX3600 as we saw on the boat Smart Watch.
So, that’s all in the teardown. I hope you found it interesting and learned something new.
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I am currently working as an embedded systems design consultant and helping companies build custom embedded products, develop test automation solution for their PCB.
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